CN211317590U

CN211317590U - Miniature pressure sensor

Info

Publication number: CN211317590U
Application number: CN202020247648.XU
Authority: CN
Inventors: 付绍辉; 江刚; 于海军; 陈祖亮
Original assignee: Zhongshan Yougan Technology Co ltd
Current assignee: Zhongshan Yougan Technology Co ltd
Priority date: 2020-03-03
Filing date: 2020-03-03
Publication date: 2020-08-21
Anticipated expiration: 2030-03-03

Abstract

The utility model provides a miniature pressure sensor, including bottom plate and the response lid of setting on the bottom plate, be provided with induction area, first electrode and second electrode on the bottom plate, be provided with first electric conductor and the second electric conductor that do not contact each other in the induction area, first electrode is connected with the first electric conductor electricity, the second electrode is connected with the second electric conductor electricity; the induction cover is positioned above the induction area, the top of the induction cover is provided with an elastic body capable of elastically resetting, and the inner side surface of the elastic body is provided with a flexible conductor. The utility model discloses can accurate detection the pressure value that bears, can be exclusively used in clothing products such as intelligent shoe-pad.

Description

Miniature pressure sensor

Technical Field

The utility model belongs to the technical field of the pressure sensor technique and specifically relates to a miniature pressure sensor.

Background

Along with the development of science and technology, the wearable equipment of intelligence is applied to people's life gradually, from traditional intelligent bracelet, intelligent wrist-watch, expands clothing products such as intelligent shoe-pad gradually. In these smart clothing products, the corresponding sensor is an indispensable detection device, among which pressure sensors are common.

The existing pressure sensors are various in types, but the pressure sensors applied to clothes such as intelligent insoles have the characteristics of miniaturization and miniaturization. The structure of the pressure sensor in the prior art is not suitable for clothes such as intelligent insoles, and a pressure sensor with a miniature structure is needed urgently.

SUMMERY OF THE UTILITY MODEL

The utility model provides a miniature pressure sensor can accurate detection the pressure value that bears, can be exclusively used in clothing products such as intelligent shoe-pad.

The embodiment of the utility model provides a miniature pressure sensor, including bottom plate and the response lid of setting on the bottom plate, be provided with induction area, first electrode and second electrode on the bottom plate, be provided with first electric conductor and the second electric conductor that do not contact each other in the induction area, first electrode is connected with the first electric conductor electricity, the second electrode is connected with the second electric conductor electricity; the induction cover is positioned above the induction area, the top of the induction cover is provided with an elastic body capable of elastically resetting, and the inner side surface of the elastic body is provided with a flexible conductor.

Preferably, the first conductor and the second conductor are both strip-shaped, and the first conductor and the second conductor are parallel to each other.

Preferably, the first conductor and the second conductor are provided in plurality, and the first conductor and the second conductor are provided at an interval.

Preferably, the induction cover comprises a cylinder body, and the elastic body covers the top opening of the cylinder body.

Preferably, the lower end face of the cylinder body is provided with an insertion rod, the bottom plate is provided with an insertion hole, and the insertion rod is inserted into the insertion hole.

Preferably, the jacks are arranged in two and are both located outside the sensing area.

Preferably, the elastomer is silica gel, and the flexible conductor is conductive silica gel.

Preferably, the inner side surface of the elastic body is in a circular arc shape.

Preferably, the first electrode and the second electrode are provided with wiring holes.

Preferably, when the elastic body is not subjected to external pressure, the flexible electric conductor is in contact with both the first electric conductor and the second electric conductor.

The utility model discloses has following technological effect: when the elastomer bears external pressure, the flexible conductor is in contact with the first conductor and the second conductor, when the pressure born by the elastomer is increased, the contact area of the flexible conductor with the first conductor and the second conductor is increased, and the resistance value between the first electrode and the second electrode is decreased, so that the pressure applied to the pressure sensor can be calculated according to the mapping relation between the resistance value and the pressure value, and the flexible conductor can be specially used for clothes products such as intelligent insoles.

Drawings

Fig. 1 is a schematic structural diagram of a micro pressure sensor according to an embodiment of the present invention;

fig. 2 is an exploded view of a micro pressure sensor according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of an induction cover according to an embodiment of the present invention;

fig. 4 is a cross-sectional view of a micro pressure sensor according to an embodiment of the present invention.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

The embodiment of the utility model provides a miniature pressure sensor, as shown in fig. 1-4, including bottom plate 1 and the response lid 2 of setting on bottom plate 1. The bottom plate 1 is provided with a sensing area 130, a first electrode 111 and a second electrode 112, the sensing area 130 is an area with a relatively fixed position on the surface of the bottom plate 1, the sensing area 130 may not be marked, and may also be marked by a closed reticle, so as to conveniently fix the sensing cover 2. The first electrode 111 and the second electrode 112 serve as two wiring electrodes for outputting a sensing signal to a device connected thereto. The main body of the bottom plate 1 may be strip-shaped, the sensing region 130 is located at one end of the bottom plate 1, and the first electrode 111 and the second electrode 112 are both located at the other end of the bottom plate 1, so as to facilitate connection of the connection line with the first electrode 111 and the second electrode 112.

A first conductor 131 and a second conductor 132 are arranged in the sensing region 130 without contacting each other, i.e. there is no electrical connection between the first conductor 131 and the second conductor 132 without the aid of an external conductor. The first electrode 111 is electrically connected to the first conductor 131, and the second electrode 112 is electrically connected to the second conductor 132. As shown in fig. 1, the first electrode 111 and the first conductor 131 and the second electrode 112 and the second conductor 132 may be electrically connected through an intermediate line 121, the bottom plate 1 may be a printed circuit board, and the intermediate line 121, the first conductor 131, the second conductor 132, the first electrode 111, and the second electrode 112 may be reserved conductor portions of the printed circuit board.

The sensing cover 2 is located above the sensing region 130, and covers the sensing region 130. The lower end of the induction cover 2 may be fixed to the base plate 1. The top of the induction cover 2 is provided with an elastic body 21 which can be elastically reset, and the elastic body 21 can be elastically deformed under the action of external force and reset after the external force disappears. A flexible conductor 22 is provided on the inner side surface of the elastic body 21, i.e., the lower surface of the elastic body 21 in fig. 4. The flexible conductor 22 can be tightly attached to the lower surface of the elastic body 21 and can be elastically deformed correspondingly in the elastic deformation process of the elastic body 21, and meanwhile, the flexible conductor 22 can conduct electricity.

When the pressure is detected, the external pressure acts on the elastic body 21, and the direction of the pressure is generally perpendicular to the upper surface of the elastic body 21 and downward. When the amount of downward deformation of the elastic body 21 changes due to a change in the pressure applied thereto, the contact area between the flexible conductor 22 and the first conductor 131 and the second conductor 132 changes accordingly. When the pressure applied to the elastic body 21 increases, the contact area between the flexible conductor 22 and the first conductor 131 and the second conductor 132 increases, and the resistance between the first electrode 111 and the second electrode 112 decreases. The skilled person can perform tests to establish a mapping relationship between the resistance value and the pressure value in advance. After the resistance value between the first electrode 111 and the second electrode 112 is obtained, the pressure applied to the pressure sensor can be calculated according to the preset mapping relationship between the resistance value and the pressure value.

In one embodiment, the first conductor 131 and the second conductor 132 are both strip-shaped, the middle line 121 can be located outside the sensing region 130, and both the first conductor 131 and the second conductor 132 can extend into the sensing region 130 from the outside. The first conductor 131 and the second conductor 132 are parallel to each other and spaced apart by a certain distance. In the extending direction of the first and second

electric conductors

131, 132, they may pass through the ends of each other and extend to the rear ends of each other. This structure can ensure that the resistance value between the first electrode 111 and the second electrode 112 is in a negative correlation with the pressure value.

Further, the first conductor 131 and the second conductor 132 may be provided in plural numbers, and the number of the two may be the same. As shown in the figure, the first conductor 131 and the second conductor 132 are arranged at intervals, and the first conductor 131 and the second conductor 132 as a whole may be point-symmetrically distributed with respect to one position. The position point may be a center point of the sensing region 130, and the sensing region 130 may be configured as a circle, so that the position point is a center of the sensing region 130. Thus, the plurality of first conductors 131 and second conductors 132 are in contact with the flexible conductor 22, whereby the detection sensitivity can be improved.

In an embodiment, the inner side surface (the surface opposite to the inner side of the sensing cover 2) of the elastic body 21 is in a circular arc shape, the flexible conductor 22 may be located at the lowest end of the elastic body 21, the flexible conductor 22 may be in a circular disc shape, and the center of the flexible conductor 22, the center of the elastic body 21, and the location point of the above embodiment may be located on the same straight line, so that when the pressure applied increases, the change of the contact area between the flexible conductor 22 and the first conductor 131 and the second conductor 132 is a positive change, and a negative correlation between the resistance value and the pressure value between the first electrode 111 and the second electrode 112 may be ensured.

In one embodiment, the inductive cover 2 includes a cylinder 23, and the elastic body 21 covers the top opening of the cylinder 23, so as to form a cover structure, which provides sufficient space for elastic deformation of the elastic body 21. The elastic body 21 and the cylinder 23 may be integrally connected. The lower end of the induction cover 2 is fixed on the bottom plate 1.

Specifically, the lower end surface of the cylinder 23 is provided with an insertion rod 231, the bottom plate 1 is provided with an insertion hole 14, the insertion hole 14 is located outside the sensing area 130, and the insertion rod 231 is inserted into the insertion hole 14, so that the fixed connection between the cylinder 23 and the bottom plate 1 is realized. As shown in the drawings, the insertion holes 14 may be provided in two and symmetrically distributed with respect to the sensing region 130, and the corresponding insertion rods 231 are also provided in two, thereby enhancing the fixing effect of the cylinder 23.

In one embodiment, the elastic body 21 is made of silicone rubber, and has a good elastic restoring force. The flexible conductor 22 can be made of conductive silicone to ensure its elastic deformation characteristics and to be conductive.

In one embodiment, the first electrode 111 and the second electrode 112 are provided with wiring holes 110, so as to facilitate wiring and quickly connect the micro pressure sensor of the present embodiment to a corresponding circuit.

In one embodiment, when the elastic body 21 is not subjected to the external pressure, i.e. in a default state, the flexible conductive body 22 is in contact with both the first conductive body 131 and the second conductive body 132, so that the first electrode 111 and the second electrode 112 have an initial resistance value therebetween. When the elastic body 21 is subjected to the external pressure, the resistance value between the first electrode 111 and the second electrode 112 changes, so that the pressure value can be detected more sensitively.

In some other implementations, in the default state, the flexible conductor 22 is not in contact with the first conductor 131 and the second conductor 132 at the same time, that is, only when the external pressure borne by the elastic body 21 is greater than the preset value, the flexible conductor 22 is in contact with both the first conductor 131 and the second conductor 132, which is equivalent to setting the initial threshold of the detected pressure, and the case that the external pressure is less than the preset pressure is discarded, so that the interference can be filtered out, and the false detection is prevented.

The foregoing is a more detailed description of the present invention that is presented in conjunction with specific embodiments, and it is not to be understood that the specific embodiments of the present invention are limited to these descriptions. To the utility model belongs to the technical field of ordinary technical personnel, do not deviate from the utility model discloses under the prerequisite of design, can also make a plurality of simple deductions or replacement.

Claims

1. A miniature pressure sensor, characterized by: the induction cover comprises a bottom plate and an induction cover arranged on the bottom plate, wherein an induction area, a first electrode and a second electrode are arranged on the bottom plate, a first conductor and a second conductor which are not in contact with each other are arranged in the induction area, the first electrode is electrically connected with the first conductor, and the second electrode is electrically connected with the second conductor; the induction cover is positioned above the induction area, the top of the induction cover is provided with an elastic body capable of elastically resetting, and the inner side surface of the elastic body is provided with a flexible conductor.

2. The miniature pressure sensor of claim 1, wherein: the first conductor and the second conductor are both strip-shaped, and the first conductor and the second conductor are parallel to each other.

3. The miniature pressure sensor of claim 2, wherein: the first electric conductor and the second electric conductor are both provided with a plurality of electric conductors, and the first electric conductor and the second electric conductor are arranged at intervals.

4. The miniature pressure sensor of claim 1, wherein: the induction cover comprises a cylinder body, and the elastic body covers the top opening of the cylinder body.

5. The miniature pressure sensor of claim 4, wherein: the lower end face of the barrel is provided with an inserting rod, the bottom plate is provided with an inserting hole, and the inserting rod is inserted into the inserting hole.

6. The miniature pressure sensor of claim 5, wherein: the jack is provided with two and all is located outside the induction zone.

7. The miniature pressure sensor of any of claims 1-6, wherein: the elastomer is silica gel, and the flexible conductor is conductive silica gel.

8. The miniature pressure sensor of claim 7, wherein: the inner side surface of the elastic body is arc-shaped.

9. The miniature pressure sensor of any of claims 1-6, wherein: the first electrode and the second electrode are provided with wiring holes.

10. The miniature pressure sensor of any of claims 1-6, wherein: when the elastic body is not subjected to external pressure, the flexible electric conductor is in contact with the first electric conductor and the second electric conductor.